The pack contains three 15 ml bottles — how long does one bottle last and how should I store them? — Restorative nut oil for breaking hair 3x15 ml - DNC

15 ml is a small bottle, which makes sense for a concentrated oil: you use it in drops, not in palmfuls. With 2–4 drops per application, one bottle typically lasts several weeks, and the three bottles together cover a long period of regular use even if you apply the oil two or three times a week.

The small size has a practical advantage for freshness. Every time a bottle is opened, the oil is exposed to air and light. Over time this can cause natural oils to oxidize and take on a stale smell. A small bottle is used up quickly, so the oil does not sit half-empty for months, while the unopened bottles in the pack stay sealed until you need them.

Store the unopened bottles in a cool, dry place out of direct sunlight — a cabinet is better than a sunny windowsill. Keep the cap tightly closed after each use, and wipe the opening if oil collects there. A good habit with natural oils is to note the month you opened a bottle and use it within a few months. If the oil develops a sharp, rancid or noticeably different smell, or the texture changes, stop using that bottle; that is a normal sign of oxidation, not a fault in the product.